How to convert acres to hectares
ha = ac × 0.4046856422Multiply the value in acres by 0.4046856422. To go the other way, multiply by 2.471053815 (or divide by 0.4046856422).
An acre is smaller than a hectare: it takes 2.471053815 acres to make one hectare.
Worked examples
- 1 acre1 ac × 0.4046856422 = 0.4046856422 ha
- 5 acres5 ac × 0.4046856422 = 2.023428211 ha
- 10 acres10 ac × 0.4046856422 = 4.046856422 ha
- 20 acres20 ac × 0.4046856422 = 8.093712845 ha
- 100 acres100 ac × 0.4046856422 = 40.46856422 ha
Acres to hectares conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Acres (ac) | Hectares (ha) |
|---|---|
| 0.1 ac | 0.040468564 ha |
| 0.25 ac | 0.10117141 ha |
| 0.5 ac | 0.20234282 ha |
| 1 ac | 0.40468564 ha |
| 2 ac | 0.80937128 ha |
| 3 ac | 1.2140569 ha |
| 4 ac | 1.6187426 ha |
| 5 ac | 2.0234282 ha |
| 6 ac | 2.4281139 ha |
| 7 ac | 2.8327995 ha |
| 8 ac | 3.2374851 ha |
| 9 ac | 3.6421708 ha |
| 10 ac | 4.0468564 ha |
| Acres (ac) | Hectares (ha) |
|---|---|
| 12 ac | 4.8562277 ha |
| 15 ac | 6.0702846 ha |
| 20 ac | 8.0937128 ha |
| 25 ac | 10.117141 ha |
| 30 ac | 12.140569 ha |
| 40 ac | 16.187426 ha |
| 50 ac | 20.234282 ha |
| 75 ac | 30.351423 ha |
| 100 ac | 40.468564 ha |
| 250 ac | 101.17141 ha |
| 500 ac | 202.34282 ha |
| 1,000 ac | 404.68564 ha |
About the units
Acre (ac)
43,560 ft² (4,046.8564224 m²). Historically the land one ox team could plough in a day; still the US and UK unit for land parcels.
Hectare (ha)
Exactly 10,000 m² — a square 100 m on a side, about 2.47 acres. The standard unit for farmland and forestry worldwide.
Frequently asked questions
How many hectares are in one acre?
There are 0.4046856422 hectares in one acre, and this value is exact by definition.
How do I convert acres to hectares?
Multiply the number of acres by 0.4046856422. For example, 10 ac × 0.4046856422 = 4.046856422 ha.
How many acres are in one hectare?
One hectare equals 2.471053815 acres. That is the reverse factor, 1 ÷ 0.4046856422.
What is 10 acres in hectares?
10 ac = 4.046856422 ha.
Is this ac to ha converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.